• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 47 subscribers
  • Views 336 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

THS3491: Output protection circuits

ashunam
Prodigy 40 points

Part Number: THS3491

Tool/software:

Hello

I am seeking clarification on the standard methods to provide protection against overcurrent and overvoltage for THS3491. While the datasheet mentions that the device includes a current limiter, no additional details are provided regarding the specific implementation or limits.

In addition to overcurrent protection, I would appreciate your recommendations on suitable methods to safeguard the device from potential overvoltage situations. For example, we are concerned about the possibility of the output being exposed to a 50V voltage source. It is important that the protection measures we implement have minimal impact on the frequency response and distortion performance of the device.

Thank you

  • +1
    TI__Mastermind 20810 points

    Hi Ashunam,

    The current limit bullet point was added to highlight that the device has internal protection circuitry for the max output current and short circuit protection circuitry which are in the EC table on page 9. It is not something that is externally controlled or adjusted. As for overvoltage situations, the approach is to limit the output voltage with a clamping circuit. Slide 28 in the PowerPoint shows a diagram of how to do this. Transient voltage suppressor diodes (TVS) are added to the supply lines and Schottky diodes serve as current steering diodes that lead to the TVS diodes. Attached below is the PowerPoint discussing ways to protect your circuit in both EOS and ESD situations. I also attached a link to our Precision Lab videos where more information can be found regarding this topic under "Electrical overstress (EOS)."

    Best Regards,

    Ignacio

    8345.ESD_EOS (1).pptx